28
SECTION 2, continued
• If “E1” or “E2” are displayed, an error occurred during calibration.
Check the standard preparation and review the calibration; repeat
the calibration if necessary. Press
DIAG to cancel the error message
(E1 or E2
). To continue without repeating the calibration, press I/O
twice to restore the previous calibration. If “CAL?” is displayed, an
error may have occurred during calibration. The previous
calibration may not be restored. Either recalibrate or use the
calibration as is.
• To review a calibration, press CAL and then UP to view the
calibration standard values. As long as
READ is never pressed and
CAL is not flashing, the calibration will not be updated. Press
CAL
again to return to the measurement mode.
Note: For accuracy, use the same sample cell or four matched sample cells for all
measurements during calibration. Always insert the cell so the orientation mark
placed on the cell during the matching procedure is correctly aligned. (See
Section 3.2.3 on page 41 for matching sample cells).
Use only StablCal
®
Stabilized Formazin or formazin standards for
calibration. Turbidimeter performance is not guaranteed if calibrated
with co-polymer styrene divinylbenzene beads or other suspensions.
DO NOT calibrate with Gelex
®
Secondary Standards.
1. Rinse a clean sample cell several times with dilution water. Fill the
cell to the line (about 15 mL) with dilution water or use StablCal
<0.1 FNU standard.
Note: The same dilution water used for preparing the standards must be used in
this step.
2. Insert the sample cell in the cell compartment by aligning the
orientation mark on the cell with the mark on the front of the cell
compartment. Close the lid. Press
I/O.
3. Choose signal average mode option (on or off) before pressing
CAL. The SIGNAL AVERAGE key is not functional in calibration mode.
4. Press
CAL. The CAL and S0 icons will appear (the 0 will flash). The
4-digit display will show the value of the S0 standard for the
previous calibration. If the blank value was forced to 0.0, the
display will be blank. Press the
RIGHT key to get a numerical
display.
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